Samuel wesley smith



- 2 Sheets-Sheet 1.

(No Model'.)

S. W. SMITH. TELEGRAPH TRANSMITTER. v No, 447,166. Patented Feb.24,1891.

4 Y Y xmumawww m Z W/TNESSES: INVENTOR: lfl 6 1 w, L W/ 81 57% I KATTORNEYS (No-Model.) 2 Sheets-Sheet 2.

.S. W. SMITH.

TELEGRAPH TRANSMITTER.

No. 447,166. Patented Feb. 24,1891.

W/ TNE SSE 8 ATTORNEYS we wanna warms co, PNOTD-LITNLL msmmrran, 01 c.

UNITED STATES PATENT FFICE.

SAMUEL 1V ESLEY SMITH, OF NE\V YORK, N. Y.

TELEGRAPH-TRANSMITTER.

SPECIFICATION forming part of Letters Patent No. 447,166, dated February24, 1891.

Application filedllovemher 13, 1890. Serial No. 371,281. (No modeLl akey may be operated to send one letter before the movement of apreceding key is completed, thus affording means for transmitting veryrapidly.

To this end my invention consists in certain features of constructionand combinations of parts, which will be hereinafter described andclaimed.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar letters of reference indicatecorresponding parts in all the figures.

Figure 1 is a side elevation ofa transmitter embodying my invention.Fig. 2 is a broken vertical cross-section of the same. Fig. 3 is a rearelevation of the key-tube and the hollow shaft therein, a portion beingbroken away to show the means for closing the circuit and for limitingthe movement of the hollow shaft. Fig. Ais a broken plan view of thetransmitter. Fig. 5is a horizontal section of the sameon the line 5 5 ofFig 2. Fig. 6 is an enlarged sectional view on the line 6 6 of Fig. 2.Fig. 7 is an; enlarged sectional view through the main tube and hollowshaft on the line 5 5 of Fig. 2. Fig. 8 is a side elevation of amodified form of transmitter, showing a peculiar stop for limiting themovement of the transmitter-shaft. Fig. 9 is a front elevation, partlyin section, of the same. Fig. 10 is a horizontal section on the line 1010 of Fig. 8, and Fig. 11 is a detailed sectional view showing the pawland plate for moving the character-disk.

A table A has a central plate A thereon, and is also provided withbinding-screws B in the usual manner, and fixed to the plate A are thevertical supports C, in which is mounted a shaftD, which carries thesending mechanism and which is insulated in its bearings. The shaft Dhas a character-disk E fixed thereon, which hasprojecting points 6adapted to make and break the circuit, and thus transmit the characterrepresented by the disk, the insulating-washerF being fixed to the shaftat the side of the disk and insu lating material being also insertedbetween the projecting points of the disk.

A trailer G is fixed to a post G of insulating material, which is fixedto the plate A on a line with the character-disk, and the trailer isconnected with one of the bindingposts bya wire g, and as thebinding-posts are connected with the line-wire in the usual manner thepulsations transmitted to the trailer by the disk will be sent over theline in the usual way. The shaft D has also an eccentric disk H near oneend, and a spring h is mounted on a support H adjacent to the disk, sothat the pressure of the spring upon the disk will govern the movementof the shaft.

The above construction I do not claim as a part of the presentinvention, as I have alreadyfiledan application fora patent for thesame, the application having been filed June 2, 1890, Serial No.354,007.

Centrally fixed to the shaft D is a pinion I, which projects through aslot or opening J in the side of the tube J, the tube being fixed to theplate A, so as to extend vertically through the same, and the lower endof the tube having a spiral spring j therein. The tube has also avertical slot j at its upper end in the back, and mounted in the tube isa hollow shaft K, the shaft having a suitable flange at the top to limitits downward movement in the tube J and having also a stud 7t on oneside, which extends through the slot j of the tube, and thus serves as aguide for the shaft. The shaft K is cut away in its central portion, asis best shown in Figs. 3 and 7, thus forming a horizontal shoulder K atthe bottom, the central port-ion being formed on o )osite sides into arod 7t" and little above the plate A and engages with the shoulder K ofthe hollow shaft K, and thus limits the upward movement of the shaft.

A rod L extends vertically through the hollow shaft K and is suitablyinsulated therein, the upper end of the rod being formed into a head Land the lower portion of the rod beneath the lower end of the shaft Khaving a washer Z fixed thereto, so that when the rod is in an elevatedposition, as shown in Fig. 2, the washer will strike the lower end ofthe shaft K and close the circuit in the manner hereinafter described.

A washer M, of insulating material, is inserted between the washer l andthe spiral springj, and when the circuit is through the rod L, asdescribed below, it will be seen that I 5 during the downward pressureon the rod the washer Z will be forced away from the shaft K, so thatthe current cannot pass through the shaft; but during the upwardmovement of the rod and shaft the washer Z will be held against thelower end of the shaft by the action of the spring, and the circuit willthus be closed through the hollow shaft.

On the back side of the plate A is a vertical post N, which is insulatedfrom the plate and which is connected bya wire g with one of thebinding-posts B, and pivoted to the upper end of the post N is a leverO, which extends above the rod L and terminates in a handle 0, on whichmay be inscribed the let- 3o ter represented by the character-disk onthe shaft I). The lever O has also on its under side a roundedprojection 0, which impinges on the head L of the rod L, so that whenthe lever is depressed the rod L and the shaft K 3 5 will be alsodepressed, and when the pressure upon the lever is removed the spiralspringj will force the said parts upward.

The operation of the transmitter is as follows: "When the lever O isdepressed, thus depressing the rod L and the shaft K, the washer Z,which is connected with the rod L, will be forced away from the hollowshaft, and, the current which passes through the post N, lever O, androd L will be broken, so

5 that there will be no pulsations during the downward movement of thelever; but when the pressure on the lever is removed the spring j forcesthe washer against the hollow shaft K and the circuit is closed, thecurrent passing from the rod through the washer and shaft to the pinionI, shaft D, and character-disk E, and the tendency of the shaft D'toturn with accelerating speed during the upward movement of the hollowshaft is checked by the pressure of the spring h on the eccentric diskH. It will thus be seen that the movement of the character-disk whilethe character is being sent is governed entirelv by the pressure of thespring j and the spring brake h, so that an even speed is maintained.The stop-screw k and the shoulder K on the hollow shaft are adjusted inrelation to each other, so that the two parts will contact and theupward movement of the lever be checked at the completion of onerevolution of the character-disk E and shaft D; but in Figs. 8 to 11,inclusive, I have shown a modified means of stopping the shaft 1) at therequired time and also a different method of turning the character-disk.In the modified views the character-disk E is mounted loosely on theshaft D, and is connected with a circular plate P, which has one toothin the edge, as is best shown in Fig. 11, the plate being also looselymounted on the shaft, and the plate and character-disk being separatedby an insulating-washer F, a similar washer being also placed on theopposite side of the disk, and the projecting points of the disk beingmade to extend beyond the washers. A hub 19 is fixed to the shaft Dadjacent to the plate P, and from this hub extends radially an arm 1',the arm passing beyond the periphery of the plate P and having at itsend a pawl t to engage the tooth of the plate, the pawl be ing heldagainst the plate bya spring d, which connects with a rod 2 which isattached to the arm 1'. It will thus be seen that when the shaft D isturned in one direction the character-disk will not be moved, but whenturned in the opposite direction the pawl will engage the tooth of theplate P, and thus turn the plate and the character-disk. The abovemechanism is described in my former application and forms no part of mypresent application.

As shown in Figs. 8 to 11, the eccentric disk II is controlled by aspring h, which is fastened to the plate A, so as to press against thedisk, and the disk has also a laterally-extending pin 7L2. A post Q,having its upper end split, as best shown in Fig. 10, is fixed to theplate A adjacent to the disk II, and pivoted in the slot of the post isthe stop R, the rear end of which is inclined downwardly, as shown at R,and terminates in a stop-lug a", and the forward end of which projectsfrom the post and is provided atits lower extremity with a hook r toengage the pin h of the disk, the stop having its front end weighted atthe top, as shown at 0 so as to throw it normally into engagement withthe pin on the eccentric disk.

A bent arm S is fixed to the shaft K, so as to extend through the slot jof the tube J, and the free end of the arm is made to extend above theinclined portion R of the stop R. It will thus be seen that when theshaft K is depressed to operate the transmitter the arm S will strikethe inclined portion of the stop R, thus raising the hook 0" from thepin 7L2 and allowing the disk H and shaft D to turn; but when thepressure on the hollow shaft K is removed and it is allowed to springupward in the manner heretofore described the arm S will be raised fromthe stop R and the weight o will cause the front end of the stop to dropinto position to engage the pin 7& thus preventing the shaft D frommaking more than one revolution.

Having thus described my invention, I claim as new and desire to secureby Letters Patent- 1. A telegraph transmitter comprising a revolubleshaft carrying sending mechanism of the character described and having apinion fixed thereto, a slotted tube arranged opposite the pinion, aspring 7 pressed shaft mounted in the tube and having one side formedinto a rack to engage the pinion, and means for closing the circuitthrough the shaft-pinion and sending mechanism during the upwardmovement of the shaft, substantially as shown and described.

2. The combination, with the shaft having sending mechanism thereon andhaving a pinion fixed thereto, of a vertical spring-pressed hollow shafthaving a rack thereon to engage the pinion, a rod extending through the1101- ,low shaft and insulated therefrom, said rod having on its lowerportion a washer to contact with the hollow shaft, and aninsulatingwasher between the rod washer, and the spring, substantiallyas shown and described.

3. A telegraph-transmitter comprising a revoluble shaft carrying sendingmechanism of the character described, a pinion fixed to the shaft,avertically-slotted tube arranged adjacent to the revoluble shaft, aspringpressed hollow shaft mounted in the tube and having a rack formedthereon to engage the pinion, a rod extending vertically through thehollow shaft and provided at its lower portion with a washer to engagethe hollow shaft and at its upper portion with a head, aninsulating-washer between the rod-washer and the spring in the tube, anda lever for actuating the rod, substantially as shown and described.

4. The combination, with the revoluble shaft carrying sending mechanism,as shown, and provided with a pinion and with a disk having alaterally-extending pin, of a vertically-movable rack to engage thepinion and turn the shaft, a stop to engage the pin and limit themovement of the shaft, and means for releasing the stop ibythe downwardmovement of the vertical shaft, substantially as shown and described.

5. The combination, with the revoluble shaft carrying sending mechanismand provided with a pinion and with a disk having a laterally-projectingpin, of a vertically-movable rack to engage the pinion, a weighted stoppivoted in a support adjacent to the disk and provided with a hook toengage the pin of the disk, and a bent arm fixed to the vertical rackand adapted to engage the rear end of the stop, substantially as shownand described.

SAMUEL WESLEY SMITH.

Witnesses:

WARREN B. HUTOHINSON, G. SEDGWICK.

